TM 55-4920-217-15
Section VI. PNEUMATIC SYSTEM
plain water and a clean rag will suffice for cleaning dial
47. General
covers and cases. When heavy accumulations of mud,
dirt, grime, grease, or other foreign materials are to be
The Pneumatic System of Shop Set, Aircraft
removed from dial covers and cases, use a solution of
Maintenance, Semitrailer Mounted, C-8, Instrument
water and a mild soap or detergent. Extreme cases may
Shop, consists of an air compressor, electric motor
require the use of more active compounds for the
driven, and air supply tank, controls and instruments,
removal of foreign materials. Wipe off all moisture after
lines, and connectors. Compressor, tank, controls and
cleaning.
instruments, lines, and connectors are shown in figures 9
Caution: Use only approved cleaning
through 20.
compounds.
Follow the directions carefully when applying. Service
the controls of the pneumatic system by removing oil,
grit, grime, dirt, mud, grease, and other foreign materials
before and after operation. Materials that are used in
cleaning controls are the same as those used in cleaning
instrument dials and cases.
c. Adjustments.
Operator
adjustment
of
instruments is accomplished by use of the controls
provided. The operator should not attempt to make
adjustments to any instrument except by use of the
controls. Controls in the pneumatic system contain
valves which are used to regulate the air pressure to the
Figure 9. Pneumatic system installation, plan view.
tank; to regulate the air pressure to the equipment being
used and to drain the system of condensate. Refer to
48. Air Compressor
Operator maintenance of the compressor consists of
purpose of controls. To regulate the supply of air to the
service and adjustments. The TM for the compressor
air tank, open or close regulator as necessary. To adjust
outlines detail maintenance procedures for the operator.
the supply of air to the equipment being used, turn
regulator handle (fig. 5), in or out until an operating
49. Air Supply Tank
pressure (75 PSI) is obtained.
The air supply tank is mounted underneath the shop
floor at the forward left side of the shop (figs. 18 and
51. Lines and Connectors
adjustments as outlined in the technical manual.
a. General. Operator maintenance of the air lines
and connectors consist of service and adjustments.
50. Controls and Instruments
b. Servicing. Keep air lines and connectors away
from grease and oil. Remove foreign materials with
a. General.
Controls and instruments for the
approved cleaning compounds.
pneumatic system (fig. 5), consist of pressure gages, oil
Warning: Use compressed air only for
and water separator, regulators, and valves.
The
the purpose for which it is intended. Serious
operator is responsible for service and adjustment of the
injury can result from misuse.
controls and instruments.
b. Servicing. Keep instrument dial covers and
cases clean; avoid the use of oily, gritty, or dirty wiping
material for cleaning dial covers and cases. Normally,
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